<template>
    <Select @dropdownVisibleChange="handleFetch" v-bind="attrs" @change="handleChange" :options="getOptions" v-model:value="state">
        <template #[item]="data" v-for="item in Object.keys($slots)">
            <slot :name="item" v-bind="data"></slot>
        </template>
        <template #suffixIcon v-if="loading">
            <LoadingOutlined spin/>
        </template>
        <template #notFoundContent v-if="loading">
      <span>
        <LoadingOutlined spin class="mr-1"/>
        {{ t('component.form.apiSelectNotFound') }}
      </span>
        </template>
    </Select>
</template>
<script lang="ts">
    import {defineComponent, PropType, ref, watchEffect, computed, unref, watch} from 'vue';
    import {Select} from 'ant-design-vue';
    import {isFunction} from '/@/utils/is';
    import {useRuleFormItem} from '/@/hooks/component/useFormItem';
    import {useAttrs} from '/@/hooks/core/useAttrs';
    import {get, omit} from 'lodash-es';
    import {LoadingOutlined} from '@ant-design/icons-vue';
    import {useI18n} from '/@/hooks/web/useI18n';
    import {propTypes} from '/@/utils/propTypes';

    type OptionsItem = { label: string; value: string; disabled?: boolean };

    export default defineComponent({
        name: 'ApiSelect',
        components: {
            Select,
            LoadingOutlined,
        },
        inheritAttrs: false,
        props: {
            value: propTypes.oneOfType([
                propTypes.object,
                propTypes.number,
                propTypes.string,
                propTypes.array,
            ]),
            numberToString: propTypes.bool,
            api: {
                type: Function as PropType<(arg?: Recordable) => Promise<OptionsItem[]>>,
                default: null,
            },
            // 接口参数
            params: {
                type: Object as PropType<Recordable>,
                default: () => ({}),
            },
            // 支持 data.user.name形式
            resultField: propTypes.string.def(''),
            labelField: propTypes.string.def('label'),
            valueField: propTypes.string.def('value'),
            immediate: propTypes.bool.def(true),
        },
        emits: ['options-change', 'change'],
        setup(props, {emit}) {
            const options = ref<OptionsItem[]>([]);
            const loading = ref(false);
            const isFirstLoad = ref(true);
            const emitData = ref<any[]>([]);
            const attrs = useAttrs();
            const {t} = useI18n();

            // 嵌入到表单中，只需使用钩子绑定来执行表单验证
            const [state] = useRuleFormItem(props, 'value', 'change', emitData);

            const getOptions = computed(() => {
                const {labelField, valueField, numberToString} = props;

                return unref(options).reduce((prev, next: Recordable) => {
                    if (next) {
                        const value = next[valueField];
                        prev.push({
                            label: next[labelField],
                            value: numberToString ? `${value}` : value,
                            ...omit(next, [labelField, valueField]),
                        });
                    }
                    return prev;
                }, [] as OptionsItem[]);
            });
            //监听immediate属性,判断是否立即加载数据
            watchEffect(() => {
                props.immediate && fetch();
            });

            watch(
                () => props.params,
                () => {
                    !unref(isFirstLoad) && fetch();
                },
                {deep: true}
            );
            //加载数据
            async function fetch() {
                const api = props.api;
                if (!api || !isFunction(api)) return;
                options.value = [];
                try {
                    loading.value = true;
                    const res = await api(props.params);
                    if (Array.isArray(res)) {
                        options.value = res;
                        emitChange();
                        return;
                    }
                    if (props.resultField) {
                        options.value = get(res, props.resultField) || [];
                    }
                    emitChange();
                } catch (error) {
                    console.warn(error);
                } finally {
                    loading.value = false;
                }
            }

            async function handleFetch() {
                if (!props.immediate && unref(isFirstLoad)) {
                    await fetch();
                    isFirstLoad.value = false;
                }
            }

            function emitChange() {
                emit('options-change', unref(getOptions));
            }

            function handleChange(_, ...args) {
                emitData.value = args;
            }

            return {state, attrs, getOptions, loading, t, handleFetch, handleChange};
        },
    });
</script>
